/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.db.mpp.execution.operator.source;

import org.apache.iotdb.db.mpp.execution.operator.OperatorContext;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.PlanNodeId;
import org.apache.iotdb.tsfile.read.common.block.TsBlock;

public class LastCacheScanOperator implements SourceOperator {

    private final OperatorContext operatorContext;
    private final PlanNodeId sourceId;
    private TsBlock tsBlock;

    public LastCacheScanOperator(
            OperatorContext operatorContext, PlanNodeId sourceId, TsBlock tsBlock) {
        this.operatorContext = operatorContext;
        this.sourceId = sourceId;
        this.tsBlock = tsBlock;
    }

    @Override
    public OperatorContext getOperatorContext() {
        return operatorContext;
    }

    @Override
    public TsBlock next() {
        TsBlock res = tsBlock;
        tsBlock = null;
        return res;
    }

    @Override
    public boolean hasNext() {
        return tsBlock != null && !tsBlock.isEmpty();
    }

    @Override
    public boolean isFinished() {
        return !hasNextWithTimer();
    }

    @Override
    public long calculateMaxPeekMemory() {
        return tsBlock.getRetainedSizeInBytes();
    }

    @Override
    public long calculateMaxReturnSize() {
        return tsBlock.getRetainedSizeInBytes();
    }

    @Override
    public long calculateRetainedSizeAfterCallingNext() {
        return 0L;
    }

    @Override
    public PlanNodeId getSourceId() {
        return sourceId;
    }
}
